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SubjectRe: IDE DMA slower in 2.3.99pre3 than in 2.2.14 and in 2.0.36
On Sun, 26 Mar 2000, Alessandro Suardi wrote:

> According to both hdparm and 'dd'.
>
> Results, in MB/sec, for hdparm:
>
> buffer cache reads buffered disk reads
> 2.2.14 multcount=0 36.26 10.58
> 2.2.14 multcount=8 36.36 10.27
>
> 2.3.99pre3 multcount=0 36.99 8.11
> 2.3.99pre3 multcount=8 36.89 8.86
>
> 2.3.99pre3 idebus=66 37.21 8.13
> multcount=0
> 2.3.99pre3 idebus=66 36.78 8.65
> multcount=8

Your system can not do "idebus=66".........try "idebus=33" and repeat.
You have doubled the clocking and the settings of the PIO base that
DMA/UDMA extentions work off of most likely reduced.
>
> More - fishing in my old e-mail I can see that in 2.0.36 I used to
> be able to run dd if=/dev/hda of=/dev/null bs=4096 count=16384 in
>
> 0.04user 1.90system 0:06.42elapsed 30%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (81major+11minor)pagefaults 0swaps
>
> while 2.3.99-pre3 idebus=66 multcount=8 only gets to
>
> 0.02user 2.34system 0:08.91elapsed 26%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (105major+13minor)pagefaults 0swaps
>
> It seems we're far slower than we used to be... this is a Quantum
> Fireball SE4.3A, QDI Titanium IB board, TX430 chipset @66Mhz,
> AMD K6-200 with 64MB 10ns SDRAM.
>
>
> Thanks for any input,
>
> --alessandro <asuardi@uninetcom.it> <asuardi@it.oracle.com>
>
> Linux 2.2.14/2.3.99-pre3 glibc-2.1.2-11 gcc-2.95.2 binutils-2.9.5.0.31
>

Andre Hedrick
The Linux ATA/IDE guy


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